Seemingly arbitrarily assigned static IPs

[EvaUnit02]

I'm running Asuswrt-Merlin v380.68_4 on my Asus RT-AC87U. I just successfully set up Pi-hole (a DNS server) on a Raspberry Pi 3 and pointed my router to it via "Advanced Settings/LAN/DHCP Server/DNS and WINS Server Setting/DNS Server 1". It all works great with one caveat: some clients aren't hitting the LAN DNS server. I noticed the clients in question all have static IPs assigned according to the network map. However, I've only defined one static IP and that's the Pi-hole device. As far as I'm aware, the only place to set static IPs is under LAN/DCHP Server. The clients with static IPs seem to be arbitrary and come from different interfaces (both Ethernet and WiFi)

I should also note that I've run Asuswrt-Merlin for a long time. Could this be a bug related to multiple upgrades over time? Do I need to completely reset my router? Is there an easier solution? Is there another setting I've missed?

Thanks in advance for any help you could provide.

 

[JDB]

They may not have renewed their DHCP lease. With the router having reset it sees them as ‘static’ as it didn’t hand the IP out since boot.
Just cycle each of the devices in question to force a DHCP renewal.


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[EvaUnit02]

Perfect. Thanks so much for your help.